Corrugated ribbed paper



` Oct. 3, 1933. D WELLS 1,929,008

CORRUGATED RIBBED PAPER Filed June 22; 1928 ligi //f//l/l/i MIE' IHM

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fltbozmug Patented Oct. 3, i933 CORRUGATED nranED PAPER Sidney D. Wells, Quincy, Ill., assigner to Paper Mills Laboratories, Inc., Quincy, Ill., a corporation of Illinois Application June 22, 1928. Serial No. 287,598

2 Claims.

My invention relates to improvements in paper and more particularly to paper for corrugating purposes. l

An important object of my invention is the provision of a paper for corrugating purposes which will result in a product having greater strength than the'usual corrugated paper and which will be ornamental in appearance and in expensive to produce.

Other objects and advantages of-my invention will be apparent during the course oi the following description.

In the accompanying drawing which forms a part of this specification and wherein like characters of reference denote like or corresponding parts throughout the same,

Figure 1 is a plan view of a portion of a sec- :ion of corrugated paper embodying my invenion, Figure 2 is a longitudinal sectional view on the line 2-2 thereof,

Figure 3 'is a transverse sectional view on the line 3-3 of Figure 2,

Figure 4 is a plan view of another form of my invention,

Figure 5 is a similar view of still another form of my invention,

Figure 6 is aplan view ot a portion of an indented flat for egg case llers showng the application of my invention thereto, and

Figure 'I is a longitudinal sectional view of yet another form of my invention.

4 In the making of corrugated paper the trade has adopted a paper having a certain thickness and weight. For example, the paper usually used has a thickness of .009 oi' an inch and weighs about 37 pounds per 1,000 square feet. I have discovered that the same weight of paper made in alternately thick and thin sections. or in other words ribbed, will give a paper of greater strength for corrugating purposes if the corrugations and ribs bear a certain relation to one another, without the additional expense required by the use of a heavier paper.

In the drawing wherein for the purpose of illustration I have shown some preferred forms of my invention, the numeral 10 designatesA a sheet of paper having spaced parallel ribs 11 arranged longitudinally thereof and provided with corrugations 12 extending transversely of the paper and consequently at right angles to the ribs 11. It will be seen that any pressure exerted onv the corrugatibns wiil be resisted by the greater thickness of the ribs and that paper made according to my invention will `have greater strength for the same weight of paper than the smooth paper heretofore used.

In Figure 4 the ribs are shown as arranged at l 00 an angleless than 90 degrees to the corrugations. This angle may be varied at will so that' the ribs cross the corrugations.

In Figure'5 the ribs are arranged in criss-cross formation `and produce a grid-like or diamond effect, which has great strength and is also ornamental in appearance.

In the form shown in Figure 6 the ribs are applied to indented ilats 10' for egg case llers and it will be seen that the strength of these ilats is materially increased by this arrangement, the

ribs 11 extending into and crossing the indenta-l tions 12'.

Figure 'l illustrates a corrugated paper having the ribs 11 arranged on both sides of the-paper.

It will be obvious that the ribs may Fbe arranged in any shape or design so that they are at an angle to the corrugations. Not only will ribbed paper make a better corrugation sheet, but the use of ribs will make it distinctive and readily discernible by the trade. Distinctive water marks may also be incorporated which will make it possible to recognize the manufacturer as weil as add to the structural strength of thev sheet.

The ribs or marks may be formed by using a cylinder mould of proper design, a dandy roll or embossing rolls. The ribs are preferably made in the machine direction and the corrugations formed transversely of the machine direction.

The ribs are formed while the sheet is in a partially formed and moist condition and subject to ilow on the application of local pressure. Consequently the material of the sheet will ow or be displaced `to form a ribbed sheet having substantially uniform 'density throughout, as

shown in Figure 3.

While I have shown and described the preferred embodiment of my invention it is to be understood that various changes in the shape, size.

directionV of the paper making machine whilemaintaining substantially uniform density throughout the sheet, and corrugating said paper in a direction which is at an angle t' the machine direction.

SIDNEY, D. WELLS.' 

